A 72-year-old man agrees to have #14 to be extracted for immediate implant 4.5 years post #18 extraction (Fig.1).  In the first stage, impression is taken for #14 and 18 implant placement with guide.  窦膜增厚（*）是#14牙源性感染，其实是好事，容易内提升，没有必要扑灭如火如荼的炎症。

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Xin Wei, DDS, PhD, MS 1st edition 03/31/2021, last revision 04/27/2021